Rowing exercise machine



FIG. 1 is a top front perspective view of a rowing exercise machine, showing my new design in its environment;

FIG. 2 is a right side elevation view thereof.;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a front elevation view thereof;

FIG. 7 is a rear elevation view thereof; and,

FIG. 8 is a top rear side perspective view.

The broken lines in FIG. 1 depict environment shown in use and form no part of the claimed design. 

CLAIM The ornamental design for a rowing exercise machine, as shown and described. 